Quoted from Fezmid:You're close -- plug the Netgear 8 port switch into the Linksys WRT1200AC and you'll get more ports. That will give you 7 more ports to use.
You don't really want two WiFi devices on your network -- if you do need more coverage in your house, you want what's called a "mesh" network. Look at Netgear Orbi or Ubiquiti (those are the two I have experience with and they work great, but there are others).
To help you understand why...
- the Linksys WRT1200 is your router AND Firewall
- everything has to be on the "inside" of your firewall (so it can protect you)
--- that's why you can't add the switch between the Modem and the Router
